Turn-to-turn short circuit is an electrical fault that may occur during the production, processing and application of any motor winding. When a turn-to-turn short circuit fault occurs, can it be repaired and what measures can be taken? This is a question raised by a netizen.

The winding and embedding of motor windings may have adverse effects on the insulation layer of the electromagnetic wire. Whether it is enameled electromagnetic wire or mica wire used in molded windings, it is difficult to avoid such problems. The molding process of molded windings also has a great impact on the quality of the insulation layer of the electromagnetic wire. When the mold is not suitable or the winding shape design is unreasonable, it will cause serious insulation damage during the molding process, which is a potential quality hazard of inter-turn short circuit problems.

When similar problems occur in the winding before varnishing, necessary insulation remedial measures can be taken to isolate and protect the damaged electromagnetic wire; during the winding insulation treatment process, the insulating paint can play a certain role in strengthening the insulation between turns, and the insulation performance of the originally damaged electromagnetic wire may fully meet the insulation performance requirements of the motor; however, if the insulation effect is not very obvious, it will inevitably lead to electrical quality failures during the operation of the motor, that is, turn-to-turn short circuit problems will occur during operation.

In comparison, the inter-turn short-circuit problem of the winding before the motor is running is mostly discovered through the inter-turn insulation tester, and there is still a chance to take some effective remedial measures; when the winding has a turn short-circuit failure during the whole machine test or operation of the motor, there is almost no possibility of repair.

When a turn-to-turn short circuit fault occurs during the operation of the motor, the fault manifests itself as problems with the insulation of multiple turns, and some even affect the entire coil. More seriously, it will affect the insulation between phases and the insulation to the ground. That is, the turn-to-turn short circuit fault has a large derivative effect, and the degree of the turn-to-turn fault will also be relatively serious. The insulation layer of the electromagnetic wire is almost in a peeling state, so the entire winding must be replaced.

Therefore, many motor manufacturers attach great importance to the processing technology of windings, trying their best to reduce and eliminate the hidden dangers of insulation failures, and fundamentally improve the electrical performance level of the motor.